This anime is very unusual but definitely an enjoyable one.
Background:
Tsubaki Akira happens to taste the saliva of Urabe Mikito, who has just moved to his school. When he experiences a fever after not having the taste of Urabe's saliva, Urabe concludes that his lovesickness can only be cured by her saliva.
This anime can possibly get disgusting to some people, but it is really interesting and different.